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//
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#pragma once
#include "GnufBase.h"
#include <QLayout>
#include <QRect>
#include <QStyle>

namespace gnuf {
 
    // 流式布局
    // from https://doc.qt.io/qt-5/qtwidgets-layouts-flowlayout-example.html
    class GNUF_BASE_EXPORT QFlowLayout : public QLayout
    {
    public:
        explicit QFlowLayout(QWidget *parent, int margin = -1, int hSpacing = -1, int vSpacing = -1);
        explicit QFlowLayout(int margin = -1, int hSpacing = -1, int vSpacing = -1);
        ~QFlowLayout();

        void addItem(QLayoutItem *item) override;
        int horizontalSpacing() const;
        int verticalSpacing() const;
        Qt::Orientations expandingDirections() const override;
        bool hasHeightForWidth() const override;
        int heightForWidth(int) const override;
        int count() const override;
        QLayoutItem *itemAt(int index) const override;
        QSize minimumSize() const override;
        void setGeometry(const QRect &rect) override;
        QSize sizeHint() const override;
        QLayoutItem *takeAt(int index) override;

    private:
        int doLayout(const QRect &rect, bool testOnly) const;
        int smartSpacing(QStyle::PixelMetric pm) const;

        QList<QLayoutItem *> itemList;
        int m_hSpace;
        int m_vSpace;
    };
}
